21237339 has 8 divisors (see below), whose sum is σ = 28409920. Its totient is φ = 14111496.

The previous prime is 21237331. The next prime is 21237341. The reversal of 21237339 is 93373212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21237339 - 2³ = 21237331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21237331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10609 + ... + 12450.

It is an arithmetic number, because the mean of its divisors is an integer number (3551240).

Almost surely, 2^21237339 is an apocalyptic number.

21237339 is a deficient number, since it is larger than the sum of its proper divisors (7172581).

21237339 is a wasteful number, since it uses less digits than its factorization.

21237339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23369.

The product of its digits is 6804, while the sum is 30.

The square root of 21237339 is about 4608.3987457684. The cubic root of 21237339 is about 276.9278920162.

The spelling of 21237339 in words is "twenty-one million, two hundred thirty-seven thousand, three hundred thirty-nine".